Scientists Confirm that Dispersants Are Increasing Contamination in the Gulf
From the naked capitalism blog.
Peter Hodson, an aquatic toxicologist from Queen’s University in Kingston, Ontario, presented his case on 9 November at a meeting of the Society of Environmental Toxicology and Chemistry in Portland, Oregon…
The problem, explains Hodson, is that the dispersed cloud of microscopic oil droplets allows the PAHs to contaminate a volume of water 100–1,000 times greater than if the oil were confined to a floating surface slick. This hugely increases the exposure of wildlife to the dispersed oil. …
Worse, the toxic constituents of oil hang around longer than other components, another speaker told the meeting. “This idea that there’s an oil biodegradation rate doesn’t hold,” says Ronald Atlas, a microbiologist at the University of Louisville, Kentucky, who has studied the aftermath of the 1989 Exxon Valdez spill in Alaska. Alkanes, the simple hydrocarbons that comprise the bulk of oil, are degraded more readily than the PAHs, he points out.
